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NEET - 2023 Previous Year Questions



NEET Biology Previous Year Questions - 2023

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: The first stage of gametophyte in the life cycle of moss is protonema stage.
Reason R: Protonema develops directly from spores produced in capsule.
In the light of the above statements, choose the most appropriate answer from the options given below:

NEET-2023 [plant-kingdom] [class-xi ]

  • A is not correct but R is correct.
  • Both A and R are correct and R is the correct explanation of A.
  • Both A and R are correct but R is NOT the correct explanation of A.
  • A is correct but R is not correct.
  • Correct Option: B  [ Both A and R are correct and R is the correct explanation of A. ]

    Remark:

Identify the pair of heterosporous pteridophytes among the following:

NEET-2023 [plant-kingdom] [class-xi ]

  • Equisetum and Salvinia
  • Lycopodium and Selaginella
  • Selaginella and Salvinia
  • Psilolum and Salvinia
  • Correct Option: C  [ Selaginella and Salvinia ]

    Remark:

Axile placentation is observed in

NEET-2023 [Morphology-of-Flowering-Plants] [class-xi ]

  • China rose, Petunia and Lemon
  • Mustard, Cucumber and Primorose
  • China rose, Beans and Lupin
  • Tomato, Dianthus and Pea
  • Correct Option: A  [ China rose, Petunia and Lemon ]

    Remark:

Statement I: Endarch and exarch are the terms often used for describing the position of secondary xylem in the plant body.
Statement II: Exarch condition is the most common feature of the root system.
In the light of the above statements, choose the correct answer from the options given below:

NEET-2023 [Anatomy-of-Flowering-Plants] [class-xi ]

  • Statement I is incorrect but Statement II is true.
  • Both Statement I and Statement II are true.
  • Both Statement I and Statement II are false.
  • Statement I is correct but Statement II is false.
  • Correct Option: A  [ Statement I is incorrect but Statement II is true. ]

    Remark:

Family Fabaceae differs from Solanaceae and Liliaceae. With respect to the stamens, pick out the characteristics specific to family Fabaceae but not found in Solanaceae or Liliaceae.

NEET-2023 [Morphology-of-Flowering-Plants] [class-xi ]

  • Epiphyllous and Dithecous anthers
  • Diadelphous and Dithecous anthers
  • Polyadelphous and epipetalous stamens
  • Monoadelphous and Monothecous anthers
  • Correct Option: B  [ Diadelphous and Dithecous anthers ]

    Remark:

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: Late wood has fewer xylary elements with narrow vessels.
Reason R: Cambium is less active in winters.
In the light of the above statements, choose the correct answer from the options given below:

NEET-2023 [Anatomy-of-Flowering-Plants] [class-xi ]

  • A is false but R is true.
  • Both A and R are true and R is the correct explanation of A.
  • Both A and R are true but R is NOT the correct explanation of A.
  • A is true but R is false.
  • Correct Option: B  [ Both A and R are true and R is the correct explanation of A. ]

    Remark:

Cellulose does not form blue colour with lodine because

NEET-2023 [Biomolecules] [class-xi ]

  • It breakes down when iodine reacts with it.
  • It is a disaccharide.
  • It is a helical molecule.
  • It does not contain complex helices and hence cannot hold iodine molecules.
  • Correct Option: D  [ It does not contain complex helices and hence cannot hold iodine molecules. ]

    Remark:

Among eukaryotes, replication of DNA takes place in

NEET-2023 [Cell-Cycle-and-Cell-Division] [class-xi ]

  • G2 phase
  • M phase
  • S phase
  • G1 phase
  • Correct Option: C  [ S phase ]

    Remark:

Which of the following stages of meiosis involves division of centromere?

NEET-2023 [Cell-Cycle-and-Cell-Division] [class-xi ]

  • Telophase
  • Metaphase I
  • Metaphase II
  • Anaphase II
  • Correct Option: D  [ Anaphase II ]

    Remark:

The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis?

NEET-2023 [Cell-Cycle-and-Cell-Division] [class-xi ]

  • Diakinesis
  • Pachytene
  • Zygotene
  • Diplotenes
  • Correct Option: B  [ Pachytene ]

    Remark: